Dual Translation?

So I'm listening to an interview with Idris Elba, the British actor who so brilliantly played Stringer Bell on The Wire. A few minutes into it, as I listen to him speak in his native accent (which I'd never heard before), I'm prompted to reflect that there are a lot of British actors who make a good living playing Americans in TV and film, but are there any Americans playing Brit roles appearing consistently in film and TV across the pond?

None come immediately to mind...